Checksum for RHN packages

I get RHN package updates from https://xmlrpc.rhn.redhat.com/XMLRPC 

The XML-RPC method "listPackages" is used to list all the available packages 
and  method "getPackage" is used to get the package details such as NEVRA.  

I want to check if I already have the package and  use NEVRA + checksum logic for identifying the package uniquely. 
For the methods mentioned above, I am not getting the checksum and hence my package existence check up fails resulting  in package download every time. 

Suggestions  to address this issue ?  

Thanks, 
Amit

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